The World No. 18 Sen, who had finished runner-up at the 2022 edition, fought his way back from a 2-8 deficit in the decider after losing the second game to prevail 24-22 11-21 21-14 over Antonsen, a three-time medallist at the World championships, in a controversial second round match.

Earlier Sindhu, a double Olympic medallist, seemed to be in good touch as she fought hard against the world No. 1 An Se Young of Korea but failed to curb her mistakes to slip to a 19-21, 11-21 loss.

It was the Indian's seventh successive loss to the indomitable An Se Young, who had become the first Korean woman singles player to win the World Championships last year.

Sen came into the match with a 1-3 record against Antonsen, who had defeated the Indian in all the last three meetings.

But the Indian produced a good show and was leading 17-15 in the first game after some close battles initially. With two winners, Antonsen made it 17-17 but Sen was the first to gain two game points with a precise backhand flick at the corner.

The Indian squandered five game points as Antonsen stayed alive.

Eventually at 22-22, two power-packed smashes gave Sen his fifth game point and he sealed it this time when the Dane sprayed wide.

After the change of ends, Antonsen was on top of things, leading 11-7 at the break. The Dane kept a firm hold on the rallies as Sen committed too many errors and the second game slipped away quickly.

In the decider, Antonsen was up 2-8 before grabbing a 11-6 lead at the interval.

But soon the momentum shifted as the Indian won seven of the next nine points to draw parity at 13-13.

At 14-16, Antonsen was called for a fault for touching the net, which rattled the Dane. "Fault? Why? Touched the net? My racket or body?", an animated Antonsen could be heard saying to the chair umpire.

Sen soon unleashed a forehand winner to move to 16-14, which he swelled to 18-14 when a defensive shot went wide from Antonsen.

Another long rally ended up long as Lakshya stood two points away from a win. A smash gave him six match points and he converted when the Dane went wide.

PV Sindhu vs An Se Young

Sindhu, who is on a comeback trail after recovering from a left knee injury, tried to attack but her 22-year-old opponent looked in a different league as she varied the pace of the rallies and used her repertoire of strokes well to come up trumps.

For Sindhu, things went downhill after the break in the second game as errors kept piling up.

Sindhu was up 4-1 but An Se Young started reading the game better and slowed down the rallies. She kept sending the tosses and clears, waiting for errors from Sindhu, who invariably sent the shuttle wide and long.

Soon the Korean led 11-8. Sindhu kept the attack, producing a backhand push and a cross smash. The Korean, however, stayed solid in her defence to move to 13-10 and then 15-11 with another precise smash.

Sindhu tried to charge to the net and target her rival's body but Young's instinct helped her survive twice as she sent the shuttle away.

From 13-17, Sindhu fought back to 16-17. But Young again pulled away with two points before grabbing four game points with a forehand drop.

Sindhu pounced one at net and then produced a tight smash on her rival's forehand to stay alive. The Korean then slipped during a rally as Sindhu made it 19-20.

However, just in time, An Se Young sent a backhand sailing over Sindhu's head to the backline to seal the opening game.

The second game started on a tight note before An Se Young grabbed a five-point lead at the interval. Thereafter, it all went downhill for Sindhu.

"She is, of course, the top player now. But I should have been much more patient, I made unforced errors. There were easy mistakes," Sindhu said.

"In the first game it was fine but then I was coming closer and then giving away those two-three points. But I think in the second set I gave her a huge lead, and then I was making receiving mistakes.

"It’s important to keep up with her for that we need to work hard and be patient, work hard on our skill and technique."